PATH-705: Creating a path to pull in the state of the current region navmesh without downloading the navmesh binary.

BUGFIX: Correcting a behavior where moving the cursor over a selected object inappropriately called updateControls().  Fix was to break the updateControl() functionality into two separate handlers updateControlsOnScrollListChange() and updateControlsOnInWorldSelectionChange().

WIP: path-722. Some agent_state_updates come through (god mode), region crossings, cleanup logic is a TBD, etc..

PATH-713: Disabling all editable object fields on the build tools floater when a static pathfinding object is in not in the current region.

PATH-705: First pass at removing the agent state functionality. WIP -- still need to remove XXX_STINSON_AGENT_STATE_DELETE_ME ifdef'ed code.

PATH-726: Removing the DEPRECATED_ALTER_NAVMESH_OBJECTS_FIELD as the viewer no longer has to support the Premium Wilderness regions on the old server code.

PATH-720: Removing the MISSING_MODIFIABLE_FIELD_WAR as the viewer no longer has to support the Premium Wilderness regions on the old server code.

PATH-719: Removing the DEPRECATED_NAVMESH_PERMANENT_WALKABLE_FLAGS as the viewer no longer has to support the Premium Wilderness regions on the old server code.

PATH-714: Removing the DEPRECATED_UNVERSIONED_NAVMESH as the viewer no longer has to support the Premium Wilderness regions on the old server code.